/**
 * Copyright (c) 2018-2021, NVIDIA CORPORATION. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once
#include <torch/extension.h>
#ifndef _nccl_p2p_h_
#define _nccl_p2p_h_

namespace apex {
namespace contrib {
namespace nccl_p2p {
at::Tensor get_unique_nccl_id(int n);
int init_nccl_comm(at::Tensor unique_nccl_id, int my_rank, int num_ranks);
void left_right_halo_exchange_inplace(int handle, int left_rank, int right_rank, at::Tensor left_output_halo,
                                      at::Tensor right_output_halo, at::Tensor left_input_halo,
                                      at::Tensor right_input_halo);
std::vector<at::Tensor> left_right_halo_exchange(int handle, int left_rank, int right_rank, at::Tensor left_output_halo,
                                                 at::Tensor right_output_halo);
void add_delay(int delay);
}  // namespace nccl_p2p
}  // namespace contrib
}  // namespace apex
#endif
